A recent discovery of giant ammonia-rich hailstones, dubbed mushballs, on Jupiter might explain why Uranus and Neptune seem to have no ammonia in their atmospheres.
Stinky 'mushball' hailstones on Uranus may explain an atmospheric anomaly there (and on Neptune, too) : Read more
Stinky 'mushball' hailstones on Uranus may explain an atmospheric anomaly there (and on Neptune, too) : Read more